Jawabanmu

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2014-03-17T11:26:08+07:00
F = m/v
v = F/m
   = 10 N / 5 kg
   = 2
kecepatan 2 detik = 2 * 2= 4

Ek = 1/2 mv²
     = 1/2 * 5 kg*2²
     = 10
2014-03-17T12:07:31+07:00